Interfitting ladder



FIG. 1 is a rear elevational view, broken away in the center thereof to indicate indeterminate length, of an interfitting ladder embodying my new design;

FIG. 2 is a side elevational view of said ladder, similarly broken away;

FIG. 3 is a front elevational view of said ladder, similarly broken away;

FIG. 4 is a top planar view of said ladder;

FIG. 5 is a bottom planar view of said ladder. 

The ornamental design for an interfitting ladder, as shown and described. 